Hundreds of people gathered in Milwaukee Saturday to protest a Florida jury's decision in the George Zimmerman trial.

An estimated 500 to 1,000 people gathered at the Federal Courthouse in downtown Milwaukee Saturday at mid-day to listen to speakers call for the Department of Justice to file civil rights charges against Zimmerman.

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Zimmerman was cleared of homicide charges one week ago in a trial that focused on his confrontation and eventual shooting of Trayvon Martin.

Milwaukee Police blocked off a portion of Wisconsin Avenue near the courthouse to allow the crowd to gather. Officers reported few issues at the 2-hour rally and said no arrests were made.

The mother of Darius Simmons was also in attendance, and was recognized by the speakers. Patricia Larry sat with other family and friends who carried a sign with Simmons' photos stating "Justice Was Done."

Simmons was shot and killed by his 76-year-old neighbor John Spooner. He was found guilty of homicide earlier this week by a Milwaukee jury and will be sentenced Monday.

Milwaukee was one of several cities hosting "Justice For Trayvon" rallies around the country Saturday.

Hundreds of people, including the music superstars Jay-Z and Beyonce, assembled in New York City Saturday.

Martin's mother, Sybrina Fulton, and the Rev. Al Sharpton were leading the vigil on a plaza in downtown Manhattan.

The parents of Trayvon Martin joined thousands of Americans at more than 100 scheduled vigils in cities nationwide demanding Saturday what they described as justice for their 17-year-old son, who was shot dead last year.

"It's overwhelming," Tracy Martin told CNN at a rally in Miami attended by hundreds of supporters, many of whom chanted, "No Peace! No Justice!"

"It sends a message to the nation that we're not going to sit back and let our children be killed and don't say anything about it."

Surveying the crowd, he said, "This is what keeps us going -- all of these people that are out here to support us: white, black, brown. There's a mixture of people. Everybody is out to support not only Trayvon, but their children as well."